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The fact that it doesn't jive with the rest of the picture is what tells us it's an artifact. Nothing else has "shadows" on top and bottom, but the artifact does (or appears to), and it's typical for the lighting on artifacts to not match the rest of the photo...that's one way you can tell they are artifacts.
Looks to dark on the outline of the object. Like it was pasted there. If it wasn't pasted there, it doesn't appear to be an artifact...that wouldn't jive with the rest of the picture, in my opinion. Therefore it could be...amazing.